Question

我有2个表odds和matches：

匹配：有match_id和match_date

赔率：有id，timestamp，result，odd_value，user_id，match_id

我有一个查询，从每个用户的表中获取以下信息：

奖金：每位用户的获胜赌注。（当odds.result = 1时）
输了：每个用户丢失的赌注。（当odds.result！= 1时）
points：每个用户的点数（odds.odd_value的总和）。
奖励：对于每个连续5次奖金，我想为此变量添加额外奖励。（对于每个用户）

如何计算奖金？我尝试使用此查询并遇到问题：（您可以在此处查看SQL Fiddle）

计算的奖金不适合所有用户：

第一位用户:(奖金：13，奖金= 2）。

第二位用户:(奖金：8，奖金= 2）这里奖金应为1。

第三位用户:(奖金：14，奖金= 3）这里奖金应为2。

为什么查询无法正确计算bonus？

        select  d.user_id,
        sum(case when d.result = 1 then 1 else 0 end) as winnings, 
        sum(case when d.result = 2 then 1 else 0 end) as loses,
        sum(case when d.result = 1 then d.odd_value else 0 end) as points,
        f.bonus
FROM odds d
    INNER JOIN
    (
      SELECT  
            user_id,SUM(CASE WHEN F1=5 THEN 1 ELSE 0 END) AS bonus
        FROM
        (
          SELECT 
            user_id,
            CASE WHEN result=1 and @counter<5 THEN @counter:=@counter+1 WHEN result=1 and @counter=5 THEN @counter:=1 ELSE @counter:=0 END AS F1
          FROM odds o
          cross join (SELECT @counter:=0) AS t
          INNER JOIN matches mc on mc.match_id = o.match_id
           WHERE MONTH(STR_TO_DATE(mc.match_date, '%Y-%m-%d')) = 2 AND 
                  YEAR(STR_TO_DATE(mc.match_date, '%Y-%m-%d')) =  2015 AND
                  (YEAR(o.timestamp)=2015 AND MONTH(o.timestamp) = 02)            
        ) Temp
        group by user_id
        )as f on f.user_id = d.user_id
      group by d.user_id

Answer 1

我不确定您的结果与matches表，

有何关联

如果需要，您可以添加WHERE / INNER JOIN子句。

这是link to fiddle

根据您的意见

和last iteration：

这是一个查询：

SET @user:=0;

select  d.user_id,
        sum(case when d.result = 1 then 1 else 0 end) as winnings, 
        sum(case when d.result = 2 then 1 else 0 end) as loses,
        sum(case when d.result = 1 then d.odd_value else 0 end) as points,
        f.bonus
FROM odds d
    INNER JOIN
    (
      SELECT  
            user_id,SUM(bonus) AS bonus
        FROM
        (
          SELECT 
            user_id,
            CASE WHEN result=1 and @counter<5 AND @user=user_id THEN @counter:=@counter+1 

                 WHEN result=1 and @counter=5 AND @user=user_id THEN @counter:=1 

                 WHEN result=1 and @user<>user_id THEN @counter:=1 
                 ELSE 
                 @counter:=0 
            END AS F1,
            @user:=user_id,
            CASE WHEN @counter=5 THEN 1 ELSE 0 END AS bonus 
          FROM odds o
          ORDER BY user_id , match_id         
        ) Temp
        group by user_id
        )as f on f.user_id = d.user_id
      group by d.user_id

如何将用户变量用作包含GROUP BY语句的内部联接查询的计数器？

1 个答案: